Borehole Capacity Testing in Zimbabwe - Determining The Yield Of Your Borehole!

Written By  ProWater Media

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The maximum safe yield of a Borehole represents its dependable and continuous output during a long drought. 

Homeowners should know their Borehole yield to ensure it can sustain them in demanding times. The Borehole yield may be found in the Borehole Report created when the Borehole was drilled and its pump installed. Many communities also require a yield test when a property is bought or sold.

What Is A Borehole Capacity or Yield Test? Determining the yield of a Borehole involves a test to see the balance between the maximum amount of water that can be pumped out of the Borehole and the amount of water that recharges back into the Borehole from the surrounding groundwater source.

Borehole Capacity Testing in Zimbabwe

The test requires the continuous pumping of the Borehole for an extended period of time. During the pumping period, measurements are made of: 

• The rate at which water is being pumped out of the Borehole and
• The distance the water level is lowered in the Borehole as a result of the pumping, known as the drawdown. 

Balance, or equilibrium, is achieved when the water level within the Borehole stops dropping for a given discharge rate. Once equilibrium is achieved, less pumping results in less drawdown. 

Borehole Drilling professionals rely on the yield pump test to set the Borehole Pump at the correct level. It is common to maintain the water level in the Borehole at least 5 metres above the top of the submersible pump. This depth of water over the pump provides a reasonable level of safety for dry conditions and provides for full cooling of the pump’s electrical motor. 

Don’t be fooled by water pressure in the home. Pressure at the tap is not necessarily dependent on ample Borehole yield. Proper sizing of the Borehole pump, pressure tank and distribution lines by Borehole professionals can increase pressure when yields are quite low. 

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